[CentOS-virt] What kernel params to use with KVM hosts??
Steven Ellis
steven.ellis at bulletin.net
Wed Mar 17 06:18:11 UTC 2010
carlopmart wrote:
> Hi all,
>
> I order to reach maximum performance on my centos kvm hosts I have use these params:
>
> - On /etc/grub.conf:
>
> kernel /vmlinuz-2.6.18-164.11.1.el5 ro root=LABEL=/ elevator=deadline quiet
>
> - On sysctl.conf
>
> # Special network params
> net.core.rmem_default = 8388608
> net.core.wmem_default = 8388608
> net.core.rmem_max = 16777216
> net.core.wmem_max = 16777216
> net.ipv4.tcp_rmem = 1048576 4194304 16777216
> net.ipv4.tcp_wmem = 1048576 4194304 16777216
>
>
> # Disable netfilter on bridges.
> net.bridge.bridge-nf-call-ip6tables = 0
> net.bridge.bridge-nf-call-iptables = 0
> net.bridge.bridge-nf-call-arptables = 0
>
> # Virtual machines special kernel params
> vm.swappiness = 0
>
Care to explain some of your choices.
In particular why
vm.swappiness = 0
and why elevator=deadline over noop.
Steve
--
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